Android实现伴奏录音合成MP3

 /** * 播放伴奏 */ private MediaPlayer player; /** * 返回按钮 */ private ImageView btnBack; /** * 切换歌曲 */ private Button btnSwitchSong; /** * 伴唱时长 */ private TextView tv_recod_time; /** * 歌词VIEW */ private LyricView lv_lyric; /** * 开始录制 */ private Button btnPlay; /** * 标题 */ private TextView ivTitle; private boolean canPlay = true; private boolean isPause = false; /*** * 背景音乐模式 */ private BackgroudMusicMode mode = BackgroudMusicMode.Accompany; /** * 歌曲id */ private String songId; /** * 歌曲名称 */ private String songName; /** * 歌手名字 */ private String singerName; /** * 伴奏文件 */ private File file; /** * 是否正在录制 */ private boolean isStart = false; /** * 录音状态 */ private boolean starting = false; /** * 伴奏时间 */ private int bztimetmp = 0; /** * 伴奏时间 */ private String bztime = ""; /** * 录制时间 */ private int recordTimeLength=0; /** * 更新伴奏时间 */ private RecordTask rt = null; /** * 录制频率，单位hz.这里的值注意了，写的不好，可能实例化AudioRecord对象的时候，会出错。我开始写成11025就不行。这取决于硬件设备 * 设置音频采样率，44100是目前的标准，但是某些设备仍然支持22050，16000，11025 */ private int sampleRateInHz = 44100; /** * 设置音频的录制的声道CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道 */ private int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO; /** * 音频数据格式:PCM 16位每个样本。保证设备支持。PCM 8位每个样本。不一定能得到设备支持。 */ private int audioFormat = AudioFormat.ENCODING_PCM_16BIT; /** * 调整播放音量 */ private AudioManager audioManager; /** * 最大音量 */ private int maxVolume = 0; /** * 当前音量 */ private int currentVolume = 0; /** * AudioRecord 写入缓冲区大小 */ protected int m_in_buf_size; /** * 录制音频对象 */ private AudioRecord mRecorder; /** * 录入的字节数组 */ private byte[] m_in_bytes; /** * 存放录入字节数组的大小 */ private LinkedList m_in_q; /** * AudioTrack 播放缓冲大小 */ private int m_out_buf_size; /** * 播放音频对象 */ private AudioTrack mAudioTrack; /** * 播放的字节数组 */ private byte[] m_out_bytes; /** * 录制音频线程 */ private Thread record; /** * 播放音频线程 */ private Thread play; /** * 让线程停止的标志 */ private boolean flag = true; /** * 是否启动回声 */ private boolean room_flag = true; /***上面有个播放歌词的组件 /*** * 初始化 */ private void init() { audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE); maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL); currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_VOICE_CALL); registerHeadsetPlugReceiver(); ycApplication = (YueChangApplication) getApplication(); coverDao = new CoverDao(getApplicationContext()); Bundle bundle = getIntent().getExtras(); songId = bundle.getString("songId"); songName = bundle.getString("songName"); singerName = bundle.getString("singerName"); if (songId != null) { // AudioRecord 得到录制最小缓冲区的大小 m_in_buf_size = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); // 实例化播放音频对象 mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, m_in_buf_size); // 实例化一个字节数组，长度为最小缓冲区的长度 m_in_bytes = new byte[m_in_buf_size]; // 实例化一个链表，用来存放字节组数 m_in_q = new LinkedList(); // AudioTrack 得到播放最小缓冲区的大小 m_out_buf_size = AudioTrack.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); // 实例化播放音频对象 mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat, m_out_buf_size, AudioTrack.MODE_STREAM); // 实例化一个长度为播放最小缓冲大小的字节数组 m_out_bytes = new byte[m_out_buf_size]; record = new Thread(new recordSound()); //   if(ycApplication.isHeadsetplug()){ //   }else{ //    m_out_trk = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRateInHz, channelConfig, audioFormat, //      m_out_buf_size, AudioTrack.MODE_STREAM); //   } } } /** * * 类描述：录音线程 * * @version 1.0 */ class recordSound implements Runnable { @Override public void run() { // 初始化输出流 DataOutputStream dos = null; try { File audioFile = new File(SongUtil.getRecordSingPCMPath(songId)); // 初始化输出流 dos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(audioFile))); byte[] bytes_pkg; if (mRecorder.getState() == AudioRecord.STATE_UNINITIALIZED) { // 实例化播放音频对象 mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, m_in_buf_size); } // 开始录音 mRecorder.startRecording(); while (flag) { int size = mRecorder.read(m_in_bytes, 0, m_in_buf_size); bytes_pkg = m_in_bytes.clone(); if (m_in_q.size() >= 2) { m_in_q.removeFirst(); } m_in_q.add(bytes_pkg); if ((ycApplication.isHeadsetplug() && ycApplication.isOpenInEarphone()) || (!ycApplication.isHeadsetplug() && ycApplication.isOpenInSpeaker())) { //Log.d(SingSingleActivity.this.getClass().getName(), "启动录音播放1"); if (play == null||!room_flag) { //Log.d(SingSingleActivity.this.getClass().getName(), "启动录音播放2"); room_flag = true; play = new Thread(new playRecord()); // 启动播放线程 play.start(); } } else { if(room_flag||play != null){ //Log.d(SingSingleActivity.this.getClass().getName(), "关闭录音播放1"); room_flag = false; if (play != null) { play.interrupt(); } play = null; } } // 写入PCM文件 dos.write(bytes_pkg, 0, size); dos.flush(); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { try { // 关闭录音 if (mRecorder != null) { try { if (mRecorder.getState() == AudioRecord.STATE_INITIALIZED) { // 关闭录音 mRecorder.stop(); mRecorder.release(); } } catch (Exception e2) { // TODO: handle exception } } if (dos != null) { dos.close(); } } catch (Exception e2) { // TODO: handle exception e2.printStackTrace(); } } } }

 /*** * 方法描述：本地方法调用JNI合并mp3PCM与sourcePCM * @param sourcePCM * @param mp3PCM * @param mixPCM * @return */ public static native int mix2PCMToPCM(String sourcePCM, String mp3PCM, String mixPCM); String recordPCMPath = SongUtil.getRecordSingPCMPath(songId); //录音生成的PCM文件 String accompanyPCMPath = SongUtil.getAccompanySongPCMPath(songId); //伴奏解码生成的PCM文件 String mixPCMPath = SongUtil.getMixSingPCMPath(songId); //合成后的PCM文件 String mixMP3Path = SongUtil.getMixSingMp3Path(songId); //合成后的MP3文件 // 混音 int code = SongEncodeUtil.mix2PCMToPCM(recordPCMPath, accompanyPCMPath, mixPCMPath); if (code == 0) { // 转换混合后音频格式 TO mp3 int i = SimpleLame.convert(mixPCMPath, mixMP3Path, m_in_buf_size); Log.i(SingSingleActivity.this.getClass().getName(), "转换" + i + "混音完成"); saveMp3File(mixMP3Path); }